init working

page_script.js

@@ -0,0 +1,29 @@
+// page_script.js - runs inside the page context
+
+chrome.runtime.onMessage.addListener((msg, sender, sendResponse) => {
+  if (msg.action === "setVolume") {
+    const player = document.querySelector(".html5-video-player");
+    if (player && typeof player.setVolume === "function") {
+      player.setVolume(msg.volume);
+    } else {
+      const video = document.querySelector("video");
+      if (video) video.volume = Math.max(0, Math.min(1, msg.volume / 100));
+    }
+    sendResponse({ ok: true });
+  }
+
+  if (msg.action === "getVolume") {
+    let v = null;
+    const player = document.querySelector(".html5-video-player");
+    if (player && typeof player.getVolume === "function") {
+      v = player.getVolume();
+    } else {
+      const video = document.querySelector("video");
+      if (video && typeof video.volume === "number") {
+        v = Math.round(video.volume * 100);
+      }
+    }
+    sendResponse({ volume: v });
+  }
+  return true; // async safe
+});